One problem related to engine exhaust system has been reported for the 2012 Honda Civic. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2012 Honda Civic based on all problems reported for the 2012 Civic.
There is a strong smell of exhaust if you stand next to the car while it's idling & parked or stationary. I bought the car in 2014 or 15 and noticed it soon after. I've had it checked for exhaust leaks a few times, but no one has found one. It seems like it could cause problems with emissions, and let fumes into the passenger compartment if a door or window was open long enough.